hi
following on from my previous post, re maths, i spent some hours yesterday,trying to get the circuit- http://www.slottechforum.com/slotin...ltage Comparators/LM339/LM339 oscillators.pdf bottom left, to work, without success, i tried two more similar circuits, again unsuccessfully,the circuits showed either no oscillation,or unstable oscillations at many different frequencies, none anywhere close to the xtal freqency of two megahertz
i checked each board twice for errors, none were found, the circuits are fairly simple, so not much to go wrong.
i am using the LM319N high speed comparator which should be ok at this frequency, i think.
i tried the xtal in a transistor based oscillator and it worked fine,
ive decided to weaken and go with a can type xtal oscillater,but id love to know why these fairly generic circuits didnt work.i must have missed something drastic,
any help much appreciated
doug
following on from my previous post, re maths, i spent some hours yesterday,trying to get the circuit- http://www.slottechforum.com/slotin...ltage Comparators/LM339/LM339 oscillators.pdf bottom left, to work, without success, i tried two more similar circuits, again unsuccessfully,the circuits showed either no oscillation,or unstable oscillations at many different frequencies, none anywhere close to the xtal freqency of two megahertz
i checked each board twice for errors, none were found, the circuits are fairly simple, so not much to go wrong.
i am using the LM319N high speed comparator which should be ok at this frequency, i think.
i tried the xtal in a transistor based oscillator and it worked fine,
ive decided to weaken and go with a can type xtal oscillater,but id love to know why these fairly generic circuits didnt work.i must have missed something drastic,
any help much appreciated
doug